Manual tagging is useful when cleaning data or updating individual records.
To tag a single contact:
Go to Contacts
Open the contact profile
Locate the Tags area
Add a new tag or select an existing one
Save
To tag multiple contacts at once:
Go to Contacts
Select multiple contacts using the checkboxes
Click the Add Tag option in the toolbar
Choose or create a tag
Apply
Bulk tagging is helpful when:
Importing contacts
Cleaning old lists
Assigning campaign groups